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Diffstat (limited to 'arch/blackfin/kernel/setup.c')
-rw-r--r--arch/blackfin/kernel/setup.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index c2f3e73ba25..d6668328be7 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -649,6 +649,49 @@ static __init void setup_bootmem_allocator(void)
BOOTMEM_DEFAULT);
}
+#define EBSZ_TO_MEG(ebsz) \
+({ \
+ int meg = 0; \
+ switch (ebsz & 0xf) { \
+ case 0x1: meg = 16; break; \
+ case 0x3: meg = 32; break; \
+ case 0x5: meg = 64; break; \
+ case 0x7: meg = 128; break; \
+ case 0x9: meg = 256; break; \
+ case 0xb: meg = 512; break; \
+ } \
+ meg; \
+})
+static inline int __init get_mem_size(void)
+{
+#ifdef CONFIG_MEM_SIZE
+ return CONFIG_MEM_SIZE;
+#else
+# if defined(EBIU_SDBCTL)
+# if defined(BF561_FAMILY)
+ int ret = 0;
+ u32 sdbctl = bfin_read_EBIU_SDBCTL();
+ ret += EBSZ_TO_MEG(sdbctl >> 0);
+ ret += EBSZ_TO_MEG(sdbctl >> 8);
+ ret += EBSZ_TO_MEG(sdbctl >> 16);
+ ret += EBSZ_TO_MEG(sdbctl >> 24);
+ return ret;
+# else
+ return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
+# endif
+# elif defined(EBIU_DDRCTL1)
+ switch (bfin_read_EBIU_DDRCTL1() & 0xc0000) {
+ case DEVSZ_64: return 64;
+ case DEVSZ_128: return 128;
+ case DEVSZ_256: return 256;
+ case DEVSZ_512: return 512;
+ default: return 0;
+ }
+# endif
+#endif
+ BUG();
+}
+
void __init setup_arch(char **cmdline_p)
{
unsigned long sclk, cclk;
@@ -669,7 +712,7 @@ void __init setup_arch(char **cmdline_p)
/* setup memory defaults from the user config */
physical_mem_end = 0;
- _ramend = CONFIG_MEM_SIZE * 1024 * 1024;
+ _ramend = get_mem_size() * 1024 * 1024;
memset(&bfin_memmap, 0, sizeof(bfin_memmap));